Improvement in work-holders for lathes



W. P. HUFPKINS. Work-Haidersfor Lathes.-

Nu. 134,381. Patented nec.31,1872.

Will/M WITNESSES. \NVENTOR.

WILLIAM l?. HOPKINS, OF LAWRENCE, MASSACHUSETTS.

IMPROVEMENT IN WORK-HOLDERS FOR LATHES.

Speciiication forming part of Letters Patent No. ifll, dated December3l, 1872.

To all whom it may concern:

Beit known that I, WiLLIAi/r P. HorxrNs, of Lawrence, in the county ofEssex and State of Massachusetts, have invented a new and enable othersskilled in the art to make and use the same, reference being had to theaccompanying drawing forming part of this specification.

The object of this invention is to provide improved means for holdingarticles in a lathe while being acted upon by a revolving cutter turningupon centers. It also provides means whereby the range of applicationand usefulness is greatly extended beyond that ofothers heretofore usedor known.y The device is secured to the lathe-carriage tool-post in thesame manner as ordinary cutting-tools usually are.

Figure 1 is a perspective view of my invention. Fig. 2 is a sectionalillustration of the same, taken on the lines .fr y of Fig.l 1. Fig. 3 isan end and side view of the clamping-band.

Similar letters oi' reference maik corresponding parts.

All are made of metal.

A marks the bar of my device 5 B, the clampingband; and C, the jaw. Thebar A at the rear end is of the proper form to be secured in a lathetoolpost. The other end is provided with a groove, f, in which slidesthe tongue b of the jaw O. This groove f and tongue b are in a verticalposition when the device is arranged for use. The screw -bolt O passesloosely through the slot g in the endoi the bar A, and screws into thejaw O and holds the tongue b of the jaw O in the groove f of the bar A,and slides up and down with the jaw C in the slot g'of the bar A. Thejaw O is provided with the arm which extends upward near the tongue b.The top of this arm 'i is turned over the end of the bar A, and isprovided with suitable internal screw-threads so as to receive the screwS, which screws down through the top of the arm i upon the top of thebar A. This screw S serves to secure the jaw G at any desired elevation,or can be used to raise the jaw O when not as high as desired. The jaw Oat the outer end is titted to the band B, and is grooved at n on theunder side, to hold more rmly. The band B is provided with properinternal screw-threads at the top for screwing down through the tightenin g-serew a upon the top of the jaw C, so as to draw up p thelower inside end of the band B toward the under side or" the jaw O, andhold firmly articles inserted between them while being acted upon byarevolvin g cutter turning upon the centers of the lathe. The

extent of the operation is4 regulated by thek movement of thetool-carriageof the lathe and the sliding arrangement ofthe jaw O uponthe end of the bar A.

The lower portion of the band B is enlarged, as shown at m, Figs. l and3, so as to permit the insertion of larger articles than would theportion sliding upon the jaw C. This enlargement on. is reenforced orstrengthened by the rib e, plainly shown in the drawing.

This form of construction combines strength, light weight, and cheapnessof manufacture.

The sliding arrangement of the jaw O upon the end of the bar A may beconstructed upon either side, or upon the end.

Y Having described my invention, I claim as new and desire to secure byLetters Patent- 1. The jaw C, provided with the arm t' and screw S, ornot, in combination with the band B, bar A, and screw-bolt O, allconstructed and arranged substantially as and for the purpose shown anddescribed.

2.J The enlargement of the lower portion of the band B, re-enforced orstrengthened with the rib e, or not, for the purpose hereinbefore shownand described', when the band B is used in combination with the jaw C orits equivalent and the screw a..

VILLIAM P. HOPKINS.

Witnesses:

' BALDWIN GooLIDGE,

GEORGE Gf. ADAMs.

